Beer get a bit sour when keg is almost empty?

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calman

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Hello all,
Does it happen to anyone else? This is the second time it happens to me. The beer is getting sourer as the keg approaching about 1/4 full. Is it due to more CO2 in the beer? or somehow it gets spoilage from the pony tap line (which never got removed from the keg)?
First keg: brown ale, second: honey porter, both got same effects.
Thanks.
 
I've had the problem with ales that were more than 6 months old. Less so in the winter.
 
david_42 said:
I've had the problem with ales that were more than 6 months old. Less so in the winter.
Click to expand...

Why less so in the winter? Did you find out why?
My kegs are in my refrigerator all the time.
 
Got pictures of your fridge and faucets? Maybe there's a construction problem.

Is your fridge indoors or in a garage/shed?
 
kornkob said:
Got pictures of your fridge and faucets? Maybe there's a construction problem.

Is your fridge indoors or in a garage/shed?
Click to expand...

My fridge is in garage. The faucets are the black pony plastic ones, and I did not build anything, meaning I open the fridge door to fill my glass.
 
For me, it's probably just a matter of temperature. The kegger is in the garage & it gets colder out there in the winter than what I have the kegger set at, so the ale lasts longer.
 

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